$\left(3a+5b\right)\left(3a+6d\right)$
$2\log_{25}\left(x\right)-4=-3$
$\left(n^2+2n+1\right)^2$
$\lim_{x\to3}\left(\frac{x-3}{\sqrt{4x+4\:}-4}\right)$
$\left(-7m^2n^2\right)\left(3mn^2\right)$
$\frac{tanxcosx}{\sqrt{1-cos^2x}}\:$
$\frac { 2 + 2 } { 4 }$
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